Emerald ash borer (EAB) is an insect that has caused serve damage throughout the Midwest. It sweeps through cities killing every Ash tree in its path. Often an infestation begins quietly with little indication of what is to come. Within 2-5 years it suddenly appears as if it came out of nowhere. Typically by the time a homeowner notices obvious signs and symptoms - EAB has been present for more than a year. Unfortunately, it is also typically too late to save the tree.